public static Task <(bool Result, NSError Error)> DeleteObjectsAsync(
this HKHealthStore healthStore,
HKObjectType objectType,
NSPredicate predicate)
{
var tcs = new TaskCompletionSource <(bool, NSError)>();
healthStore.DeleteObjects(
objectType,
predicate,
(isCompleted, _, error) => tcs.SetResult((isCompleted, error)));
return(tcs.Task);
}